Boiler with superheater



B. BROIDO.

BOILER WITH SUPERHEATER.

APPLICATION FILED 1AN.24, 1918- Patemed Aug. 31, 19211,

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BOILER WITH SUPERHEATER.

1 APPLICATION FILED IAN-24, I9I8. 1,351, 154. Patented Aug. 31, 1920.

2 SHEETS-SHEET 2 e l L heater is placed in a position where the- UMTED STATES- PATENT oFFl-ca.

BENJAMIN-3301130, OF NEW YORK, N. Y., ASSIGNOR TO LOOOMOTIVE SUPERI-IEATER COMPANY, OF NEW YORK, N. Y., A. CORPORATION 0F DELAWARE.

BOILER WITH SUPEBHEATER.

Specication of Letters Patent.

Patented Aug. 31', 1920.

Application filed January 24, 1915.5. Seria1.,No. 213,514.

vhaving horizontal or slightly inclined water tubes connecting front and rear water legs, and -a furnace bounded by a bridge-wall at the rear leaving some space between the bridge-wall and the rear wall of the boiler;

settin The object of my invention is, to provi e an arrangement wherein the supergases coming into contact with it reach it while they are at a high temperature;

wherein the superheater is protected 'from the direct radiant heat from the furnace; wherein the relative portion of the gases passing over the superheater may be readily regulated by means at a point remote from the hottest part of the passage; wherein the passage for the gases leading over the boiler tubes is not restricted as compared with boilers of this type without superheaters; wherein the superheater shall be accessible for inspection and repairs, and its individual units be readily removable; which shall permit of ready cleaning; and which may be installed without practically an redesign or rearrangement ofy the boller itself. evident from the description that follows:

The specification ris to be read in connection with thev accompanyingdrawings, in which Figure 1 shows a longitudinal section of a boiler according to my invention; Fig.

2 as a fragmentary. section on line`22 of Fig. 1; Figs. 3 and 4 are sections, similar to Fig. 1, of modiiications, with parts broken away in Fig. 4.

The water-tubes 1 of the boiler connect front and rear water-legs 2 and 3, these legs communicating with the steam and water drum d. The furnace 5 is bounded at the front by the wall 6 and at the rear by the bridge-wall 7. Three horizontal bailles, 8,

9, and 10, direct the course of the gases over the water tubes, delivering them finally to flue 22, which communicates with the' stack.'

The superheater is placed, in my arrangement, into the space behind the bridge-wall.

In the form shown in Figs, l and 2, the

`space behind the bridge-wall.

Other objects will become superheater consists of the headers l1 and 12, connected-to which are the superheater umts 13. y The units are secured to the headers by means of the familiar clamp and bolt arrangement. The headers are located in the side wall 14, where they are out of the hot current of gases, and are accessible. The units are looped, as is clearly shown in Fig. 2, and extend transversely across the The pipe l5 delivers steam from the drum 4: to the header 11, and pipe 16 carries it away from header 12.

Bafile 8 extends from the front water leg 2 lto a point some distance from the rear water leg 3. This bams is shown located above some of the boiler tubes.

The baille 10 also extends from `the front v water leg to a point atv some distance from the rear water leg. lt is located at or near the top of the entire bank of water tubes.

Between the two is located the baiie 9.

It does not extend entirely to the front water leg, but terminates short of it, leaving a passage for the gases between its end and the front water leg. Instead of extending entirely t0 the rear water leg, which is the customary arrangement in this form of battling, this middle bae extends only to a point at some 'distance from this leg, and from its reanend a baille 17 extends down, parallel to the water legs, forming a passage 18. This bame is continued downward, dividing the space between the bridge-wall 7 and the rear boiler wall into two chambers, and terminates some distance above the bottom of the setting. About half the superheater units are located in one of the two chambers and half in the other.

At a point in the passage 18 below the boiler tubes but above the superheater units I arrangethe damper 19, capable of partly or wholly closing the passage. An opening 20, closed by a door 21, is placed in the rear wall above the damper 19. The lower wall of this opening and the damper in its closed position will be observed to form a continuous, outwardly sloping surface. l It will be noted that the arrangement described provides a double passage for the gases of combustion. A portion of them after leaving the fi'rebox and passing over the bridge-wall iiow upward, through the passage between the baffles 8 and 9, around the front end of bams 9, back through the joining l. substantially the same temperature.

vthey may be removed through a door passage between baffles 9 and 10, and up to flue 22. Another ortion after passm over the bridge-wal 7 fiows downwar over the first half of the suplerheater units, around the. lower end ofba e 17, then upward over the remaining half of the superheater units, and up` through passage 18 the first portion of the gases and being delivered together with them to flue 22.

The proportions of the .boiler and superheater, and the normal distribution of the products of combustion between them are such that the two currents of gases at the oint where they rejoin each other are of Should thisnot be the case, or should it be desired to raise or lower the degree of superheat given the steam, proper adjustment can be made bymeans of damper 19. The path over the superheater, it may be pointed out, 1s shorter than that over the water tubes, and there 1s no diiiculty in getting a portlon of the gases to take it in preference vto the longer path, while at the j, same time the path over the water tubes is not in any way restrlcted.

The advantage of my arrangement on the score of cleaning should be noted. Any accumulations of ashes, etc., on baffles 9 and 10 can be blown toward the rear and allowed to pass down through passa e 18 and out through opening 20, their alling on the superheater being prevented by damper 19, put into its closed position for thls purpose. From baiiie 8 such accumulations can also be removed toward the rear, and allowed to fall between the superheater units into the space below the superheater, whence in the setting. y

It will be clear that the precise form of the superheater does not enter into my invention, but that it may be given any suitable form. Instead of being made up of loops, it may, for example, pipes. If made upv of loops they may be variously arranged. They might, instead of lying transversely, run lengthwise, or vertically. Two forms in which they are arranged vertically are shown in Figs. 3 and Il. In the former the headers, are placed in the rear wall and the units are made up of loops half of which are located behind baflie 17, and half before it.

The boiler baffling in this case differs somewhat from that of Fig. 1. There are only two bafhes, the location and extent of the lower one 81, bein the same as that of the lower one, 8, of ig. 1; and the other one, 91, being located at the top of the bank of tubes, baille 9 of Fi joins with b 1. The rear end of baiile 91 e 17.

In the. formv of Fig. Li'the loops of the f units are al1 placed infront of baffle 17 be made up of straight 11 and 12 its extent corresponding to that of v which is here moved closer to the rear wall of the setting. The headers 11 and 12 are shown to run across the boiler, though they may evidently be arranged otherwise. Likewise, it will be clear, the units may here have loops extending in some other direction than vertical. I show here a baiic 23 extending rearwardly from the upper end of the bridge-wall and terminating some distance from baiiie 17. Its purpose is to' without losing the essential features of my Y,

invention, and such variations lI regard as forming part of my invention.

What I claim is:

l. In a boiler comprising a front and a rear water leg, horizontal parallel rows of water tubes connecting them, and a furnace `under the tubes bounded atthe rear by a bridge-wall, the combination of a baffle between two rows of tubes but terminating .short of each water-leg, a partition extendmg downwardly from the rear end of the baiiie into the space behind the bridge-wall and terminating short of the bottom of the setting, a second baille below and parallel `to the first extending from the front water leg and terminating short of the partition, and a superheater behind the bridge-wall.

2. In a boilercomprising a front and a rearwater leg, horizontal parallel rows of water tubes connecting them, and a furnace under the tubes bounded at the rear by a bridge-wall, the combination of a baflie between two rows of tubes but terminating short of each water-leg, a partition extending downwardlyv from the rear end of the baiie into' the space behind the bridge-wall and terminating short of; the bottom of the setting, a second baiile below and parallel to the first extending from the front water leg and terminating short of the partition,

Vand a'superheater, some of the elements of which are located between the bridge-wall and the partition.

3. In a boiler comprising a front and a rear water leg, a' bank of water tubes connecting them, and a furnace under the tubes bounded at the rear by a bridge-wall, lthe combination of a baiiie near the bottom of the bank of tubes and extendin from the front water leg inward, a secon baffie near the top of the .bank extending from the frontleg inward, a third baiie between the other two terminating short of both water legs,a partition extending downward from manita arrangement tWo passages are formed for' the hot gases, dividing just beyond the bridge-wal1 and reuniting just as the gases` leave the Water tubes; and a superheater behind the bridge-Wall.

4. ln apparatus of the class described, the combination of a front header, a rear header, Water tubes connecting them, a superheater, a furnace, and means to expose a portion of each of the tubes to gases directly from the furnace, and the remaining portion only to gases from the furnace .that have passed over the superheater but over substantially no boiler surface.

5. In apparatus of the class described, the combination of a Water leg, a partition spaced from it, a superheater, aurnace, and means to direct only gases from the furnace that have passed over the superheater but over substantially no boiler surface through the' space between the partition and the Water leg.

BENJIN i BRlDU., 

